Suppose that the Spanish Royal family and the government flee to New Spain after Napoleon invades in imitation of what the Portuguese did IOTL. Instead of Ferdinand VII accepting his father relinquishing his rights to the throne in favour of Napoleon instead of him, he sets sail for New Spain and doesn't recognise Joseph Bonaparte as King while using his limited means to support the anti-Napoleonic forces and his claim to the throne. Ferdinand VII stays there for some years and sets up a court-in-exile and an administrative centre and the local administrators, clergy, bourgeoisie and provincial governors get more power because they are brought into the new interim government established in Mexico City since Ferdinand VII can't do it with the few guys he brought with him from Spain.
Is this at all plausible? If so, what would the consequences be, what happens?
Thoughts? Ideas?